Messages in this thread | | | Date | Thu, 25 Sep 2008 13:20:54 -0400 | From | Mathieu Desnoyers <> | Subject | Re: [RFC PATCH 1/3] Unified trace buffer |
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* Steven Rostedt (rostedt@goodmis.org) wrote: > > On Thu, 25 Sep 2008, Mathieu Desnoyers wrote: > > The problem with sched_clock is that it gives a 1 HZ timestamp accuracy > > for events happening across different CPUs. Within this 1 HZ range, it > > uses the TSC and clip when it reaches a max. Good enough for scheduler > > or for tracing events on a single CPU, but I think it is not exactly > > what we need to reorder events happening across CPUs. > > > > > Hmm, > > sched_clock gives ns accuracy unless the tsc is disabled. And in that > case, we don't have any CPU clock :-/ >
Even on architectures with non-synchronized TSCs ?
Mathieu
> > -- Steve >
-- Mathieu Desnoyers OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
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